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9#include <linux/nfs_fs.h>
10#include <linux/vmalloc.h>
11#include <linux/module.h>
12#include <linux/sunrpc/addr.h>
13
14#include "../internal.h"
15#include "../nfs4session.h"
16#include "flexfilelayout.h"
17
18#define NFSDBG_FACILITY NFSDBG_PNFS_LD
19
20static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
21static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
22
23void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
24{
25 if (mirror_ds)
26 nfs4_put_deviceid_node(&mirror_ds->id_node);
27}
28
29void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
30{
31 nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
32 nfs4_pnfs_ds_put(mirror_ds->ds);
33 kfree_rcu(mirror_ds, id_node.rcu);
34}
35
36
37struct nfs4_ff_layout_ds *
38nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
39 gfp_t gfp_flags)
40{
41 struct xdr_stream stream;
42 struct xdr_buf buf;
43 struct page *scratch;
44 struct list_head dsaddrs;
45 struct nfs4_pnfs_ds_addr *da;
46 struct nfs4_ff_layout_ds *new_ds = NULL;
47 struct nfs4_ff_ds_version *ds_versions = NULL;
48 u32 mp_count;
49 u32 version_count;
50 __be32 *p;
51 int i, ret = -ENOMEM;
52
53
54 scratch = alloc_page(gfp_flags);
55 if (!scratch)
56 goto out_err;
57
58 new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
59 if (!new_ds)
60 goto out_scratch;
61
62 nfs4_init_deviceid_node(&new_ds->id_node,
63 server,
64 &pdev->dev_id);
65 INIT_LIST_HEAD(&dsaddrs);
66
67 xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
68 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
69
70
71 p = xdr_inline_decode(&stream, 4);
72 if (unlikely(!p))
73 goto out_err_drain_dsaddrs;
74 mp_count = be32_to_cpup(p);
75 dprintk("%s: multipath ds count %d\n", __func__, mp_count);
76
77 for (i = 0; i < mp_count; i++) {
78
79 da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
80 &stream, gfp_flags);
81 if (da)
82 list_add_tail(&da->da_node, &dsaddrs);
83 }
84 if (list_empty(&dsaddrs)) {
85 dprintk("%s: no suitable DS addresses found\n",
86 __func__);
87 ret = -ENOMEDIUM;
88 goto out_err_drain_dsaddrs;
89 }
90
91
92 p = xdr_inline_decode(&stream, 4);
93 if (unlikely(!p))
94 goto out_err_drain_dsaddrs;
95 version_count = be32_to_cpup(p);
96 dprintk("%s: version count %d\n", __func__, version_count);
97
98 ds_versions = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version),
99 gfp_flags);
100 if (!ds_versions)
101 goto out_scratch;
102
103 for (i = 0; i < version_count; i++) {
104
105
106 p = xdr_inline_decode(&stream, 20);
107 if (unlikely(!p))
108 goto out_err_drain_dsaddrs;
109 ds_versions[i].version = be32_to_cpup(p++);
110 ds_versions[i].minor_version = be32_to_cpup(p++);
111 ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
112 ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
113 ds_versions[i].tightly_coupled = be32_to_cpup(p);
114
115 if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
116 ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
117 if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
118 ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
119
120 if (ds_versions[i].version != 3 || ds_versions[i].minor_version != 0) {
121 dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
122 i, ds_versions[i].version,
123 ds_versions[i].minor_version);
124 ret = -EPROTONOSUPPORT;
125 goto out_err_drain_dsaddrs;
126 }
127
128 dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
129 __func__, i, ds_versions[i].version,
130 ds_versions[i].minor_version,
131 ds_versions[i].rsize,
132 ds_versions[i].wsize,
133 ds_versions[i].tightly_coupled);
134 }
135
136 new_ds->ds_versions = ds_versions;
137 new_ds->ds_versions_cnt = version_count;
138
139 new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
140 if (!new_ds->ds)
141 goto out_err_drain_dsaddrs;
142
143
144 while (!list_empty(&dsaddrs)) {
145 da = list_first_entry(&dsaddrs,
146 struct nfs4_pnfs_ds_addr,
147 da_node);
148 list_del_init(&da->da_node);
149 kfree(da->da_remotestr);
150 kfree(da);
151 }
152
153 __free_page(scratch);
154 return new_ds;
155
156out_err_drain_dsaddrs:
157 while (!list_empty(&dsaddrs)) {
158 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
159 da_node);
160 list_del_init(&da->da_node);
161 kfree(da->da_remotestr);
162 kfree(da);
163 }
164
165 kfree(ds_versions);
166out_scratch:
167 __free_page(scratch);
168out_err:
169 kfree(new_ds);
170
171 dprintk("%s ERROR: returning %d\n", __func__, ret);
172 return NULL;
173}
174
175static u64
176end_offset(u64 start, u64 len)
177{
178 u64 end;
179
180 end = start + len;
181 return end >= start ? end : NFS4_MAX_UINT64;
182}
183
184static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
185 u64 offset, u64 length)
186{
187 u64 end;
188
189 end = max_t(u64, end_offset(err->offset, err->length),
190 end_offset(offset, length));
191 err->offset = min_t(u64, err->offset, offset);
192 err->length = end - err->offset;
193}
194
195static bool ds_error_can_merge(struct nfs4_ff_layout_ds_err *err, u64 offset,
196 u64 length, int status, enum nfs_opnum4 opnum,
197 nfs4_stateid *stateid,
198 struct nfs4_deviceid *deviceid)
199{
200 return err->status == status && err->opnum == opnum &&
201 nfs4_stateid_match(&err->stateid, stateid) &&
202 !memcmp(&err->deviceid, deviceid, sizeof(*deviceid)) &&
203 end_offset(err->offset, err->length) >= offset &&
204 err->offset <= end_offset(offset, length);
205}
206
207static bool merge_ds_error(struct nfs4_ff_layout_ds_err *old,
208 struct nfs4_ff_layout_ds_err *new)
209{
210 if (!ds_error_can_merge(old, new->offset, new->length, new->status,
211 new->opnum, &new->stateid, &new->deviceid))
212 return false;
213
214 extend_ds_error(old, new->offset, new->length);
215 return true;
216}
217
218static bool
219ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
220 struct nfs4_ff_layout_ds_err *dserr)
221{
222 struct nfs4_ff_layout_ds_err *err;
223
224 list_for_each_entry(err, &flo->error_list, list) {
225 if (merge_ds_error(err, dserr)) {
226 return true;
227 }
228 }
229
230 list_add(&dserr->list, &flo->error_list);
231 return false;
232}
233
234static bool
235ff_layout_update_ds_error(struct nfs4_flexfile_layout *flo, u64 offset,
236 u64 length, int status, enum nfs_opnum4 opnum,
237 nfs4_stateid *stateid, struct nfs4_deviceid *deviceid)
238{
239 bool found = false;
240 struct nfs4_ff_layout_ds_err *err;
241
242 list_for_each_entry(err, &flo->error_list, list) {
243 if (ds_error_can_merge(err, offset, length, status, opnum,
244 stateid, deviceid)) {
245 found = true;
246 extend_ds_error(err, offset, length);
247 break;
248 }
249 }
250
251 return found;
252}
253
254int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
255 struct nfs4_ff_layout_mirror *mirror, u64 offset,
256 u64 length, int status, enum nfs_opnum4 opnum,
257 gfp_t gfp_flags)
258{
259 struct nfs4_ff_layout_ds_err *dserr;
260 bool needfree;
261
262 if (status == 0)
263 return 0;
264
265 if (mirror->mirror_ds == NULL)
266 return -EINVAL;
267
268 spin_lock(&flo->generic_hdr.plh_inode->i_lock);
269 if (ff_layout_update_ds_error(flo, offset, length, status, opnum,
270 &mirror->stateid,
271 &mirror->mirror_ds->id_node.deviceid)) {
272 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
273 return 0;
274 }
275 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
276 dserr = kmalloc(sizeof(*dserr), gfp_flags);
277 if (!dserr)
278 return -ENOMEM;
279
280 INIT_LIST_HEAD(&dserr->list);
281 dserr->offset = offset;
282 dserr->length = length;
283 dserr->status = status;
284 dserr->opnum = opnum;
285 nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
286 memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
287 NFS4_DEVICEID4_SIZE);
288
289 spin_lock(&flo->generic_hdr.plh_inode->i_lock);
290 needfree = ff_layout_add_ds_error_locked(flo, dserr);
291 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
292 if (needfree)
293 kfree(dserr);
294
295 return 0;
296}
297
298
299static rpc_authflavor_t
300nfs4_ff_layout_choose_authflavor(struct nfs4_ff_layout_mirror *mirror)
301{
302 if (mirror->uid == (u32)-1)
303 return RPC_AUTH_NULL;
304 return RPC_AUTH_UNIX;
305}
306
307
308static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror,
309 struct nfs4_pnfs_ds *ds)
310{
311 if (ds->ds_clp && !mirror->cred &&
312 mirror->mirror_ds->ds_versions[0].version == 3) {
313 struct rpc_auth *auth = ds->ds_clp->cl_rpcclient->cl_auth;
314 struct rpc_cred *cred;
315 struct auth_cred acred = {
316 .uid = make_kuid(&init_user_ns, mirror->uid),
317 .gid = make_kgid(&init_user_ns, mirror->gid),
318 };
319
320
321 cred = auth->au_ops->lookup_cred(auth, &acred, 0);
322 if (IS_ERR(cred)) {
323 dprintk("%s: lookup_cred failed with %ld\n",
324 __func__, PTR_ERR(cred));
325 return PTR_ERR(cred);
326 } else {
327 if (cmpxchg(&mirror->cred, NULL, cred))
328 put_rpccred(cred);
329 }
330 }
331 return 0;
332}
333
334struct nfs_fh *
335nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
336{
337 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
338 struct nfs_fh *fh = NULL;
339 struct nfs4_deviceid_node *devid;
340
341 if (mirror == NULL || mirror->mirror_ds == NULL ||
342 mirror->mirror_ds->ds == NULL) {
343 printk(KERN_ERR "NFS: %s: No data server for mirror offset index %d\n",
344 __func__, mirror_idx);
345 if (mirror && mirror->mirror_ds) {
346 devid = &mirror->mirror_ds->id_node;
347 pnfs_generic_mark_devid_invalid(devid);
348 }
349 goto out;
350 }
351
352
353 fh = &mirror->fh_versions[0];
354out:
355 return fh;
356}
357
358
359struct nfs4_pnfs_ds *
360nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
361 bool fail_return)
362{
363 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
364 struct nfs4_pnfs_ds *ds = NULL;
365 struct nfs4_deviceid_node *devid;
366 struct inode *ino = lseg->pls_layout->plh_inode;
367 struct nfs_server *s = NFS_SERVER(ino);
368 unsigned int max_payload;
369 rpc_authflavor_t flavor;
370
371 if (mirror == NULL || mirror->mirror_ds == NULL ||
372 mirror->mirror_ds->ds == NULL) {
373 printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
374 __func__, ds_idx);
375 if (mirror && mirror->mirror_ds) {
376 devid = &mirror->mirror_ds->id_node;
377 pnfs_generic_mark_devid_invalid(devid);
378 }
379 goto out;
380 }
381
382 devid = &mirror->mirror_ds->id_node;
383 if (ff_layout_test_devid_unavailable(devid))
384 goto out;
385
386 ds = mirror->mirror_ds->ds;
387
388 smp_rmb();
389 if (ds->ds_clp)
390 goto out_update_creds;
391
392 flavor = nfs4_ff_layout_choose_authflavor(mirror);
393
394
395
396
397 nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
398 dataserver_retrans,
399 mirror->mirror_ds->ds_versions[0].version,
400 mirror->mirror_ds->ds_versions[0].minor_version,
401 flavor);
402
403
404 if (ds->ds_clp) {
405 max_payload =
406 nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
407 NULL);
408 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
409 mirror->mirror_ds->ds_versions[0].rsize = max_payload;
410 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
411 mirror->mirror_ds->ds_versions[0].wsize = max_payload;
412 } else {
413 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
414 mirror, lseg->pls_range.offset,
415 lseg->pls_range.length, NFS4ERR_NXIO,
416 OP_ILLEGAL, GFP_NOIO);
417 if (fail_return) {
418 pnfs_error_mark_layout_for_return(ino, lseg);
419 if (ff_layout_has_available_ds(lseg))
420 pnfs_set_retry_layoutget(lseg->pls_layout);
421 else
422 pnfs_clear_retry_layoutget(lseg->pls_layout);
423
424 } else {
425 if (ff_layout_has_available_ds(lseg))
426 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
427 &lseg->pls_layout->plh_flags);
428 else {
429 pnfs_error_mark_layout_for_return(ino, lseg);
430 pnfs_clear_retry_layoutget(lseg->pls_layout);
431 }
432 }
433 }
434out_update_creds:
435 if (ff_layout_update_mirror_cred(mirror, ds))
436 ds = NULL;
437out:
438 return ds;
439}
440
441struct rpc_cred *
442ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
443 struct rpc_cred *mdscred)
444{
445 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
446 struct rpc_cred *cred = ERR_PTR(-EINVAL);
447
448 if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true))
449 goto out;
450
451 if (mirror && mirror->cred)
452 cred = mirror->cred;
453 else
454 cred = mdscred;
455out:
456 return cred;
457}
458
459
460
461
462
463struct rpc_clnt *
464nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,
465 struct nfs_client *ds_clp, struct inode *inode)
466{
467 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
468
469 switch (mirror->mirror_ds->ds_versions[0].version) {
470 case 3:
471
472 return ds_clp->cl_rpcclient;
473 case 4:
474 return nfs4_find_or_create_ds_client(ds_clp, inode);
475 default:
476 BUG();
477 }
478}
479
480static bool is_range_intersecting(u64 offset1, u64 length1,
481 u64 offset2, u64 length2)
482{
483 u64 end1 = end_offset(offset1, length1);
484 u64 end2 = end_offset(offset2, length2);
485
486 return (end1 == NFS4_MAX_UINT64 || end1 > offset2) &&
487 (end2 == NFS4_MAX_UINT64 || end2 > offset1);
488}
489
490
491int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
492 struct xdr_stream *xdr, int *count,
493 const struct pnfs_layout_range *range)
494{
495 struct nfs4_ff_layout_ds_err *err, *n;
496 __be32 *p;
497
498 list_for_each_entry_safe(err, n, &flo->error_list, list) {
499 if (!is_range_intersecting(err->offset, err->length,
500 range->offset, range->length))
501 continue;
502
503
504
505 p = xdr_reserve_space(xdr,
506 24 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
507 if (unlikely(!p))
508 return -ENOBUFS;
509 p = xdr_encode_hyper(p, err->offset);
510 p = xdr_encode_hyper(p, err->length);
511 p = xdr_encode_opaque_fixed(p, &err->stateid,
512 NFS4_STATEID_SIZE);
513 p = xdr_encode_opaque_fixed(p, &err->deviceid,
514 NFS4_DEVICEID4_SIZE);
515 *p++ = cpu_to_be32(err->status);
516 *p++ = cpu_to_be32(err->opnum);
517 *count += 1;
518 list_del(&err->list);
519 dprintk("%s: offset %llu length %llu status %d op %d count %d\n",
520 __func__, err->offset, err->length, err->status,
521 err->opnum, *count);
522 kfree(err);
523 }
524
525 return 0;
526}
527
528bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
529{
530 struct nfs4_ff_layout_mirror *mirror;
531 struct nfs4_deviceid_node *devid;
532 int idx;
533
534 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
535 mirror = FF_LAYOUT_COMP(lseg, idx);
536 if (mirror && mirror->mirror_ds) {
537 devid = &mirror->mirror_ds->id_node;
538 if (!ff_layout_test_devid_unavailable(devid))
539 return true;
540 }
541 }
542
543 return false;
544}
545
546module_param(dataserver_retrans, uint, 0644);
547MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
548 "retries a request before it attempts further "
549 " recovery action.");
550module_param(dataserver_timeo, uint, 0644);
551MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
552 "NFSv4.1 client waits for a response from a "
553 " data server before it retries an NFS request.");
554
